HT8500T
1550nm ITU wavelength adjustable Externally Modulated CATV Optic transmitter
Product description
HT8500T is a series of 1550nm externally modulated optic transmitter achieving the highest standards of today. The EM optic transmitter can reach high index of back to back CNR ≥ 54dB, CTB ≤ -65dB, CSO ≤ -65dB, SBS: 13~19dBm continuous adjustable. The whole unit is equipped with perfect RS232 communication interface, SNMP network management, 1+1 back-up power supply, hot-plug function available, chassis temperature auto-control. All the optical port of EM optic transmitter can be installed in the front panel (The back panel is also available if needed).
Product features
1. Externally modulated technology for HT8500T catv optic transmitter, no laser chirp, low dispersion distortion, high extinction ratio, with excellent characteristic within 40~862MHz, used in the over-long trunk of large and medium sized cable television head-end.
2.1+1 powers supply back, up hot-plug function available.
3. Narrow line width (Typ=0.3 MHz), low noise, and DFB continuous wave laser, be propitious to reduce dispersion effect.
4. The work bandwidth for HT8500T optic transmitter is up to 47~1080MHz.
5. CNR ≥ 54dB and excellent CTB, CSO index.
6. SBS: 13~19dBm, continuous adjustable.
7. ITU standard wavelength adjustable, users can adjust and set the wavelength on the front panel with ± 0.05nm stepping in the range of ± 200GHz (± 1.6nm), used in the network upgrading and expansion of WDM system.
Main application
1. Used in the over-long trunk and distribution net in the large and middle cable television central station head-end.
A)Analogue digital hybrid transmission > 200Km (with dispersion compensation).
B)Pure digital transmission (Without dispersion compensation) > 400Km,
(With dispersion compensation) >700Km.
2. VAS in DWDM fiber CATV system
3. CFG dispersion compensates system.
Application cases
1.255Km PAL-D/56CH & 20CH Digital QAM Hybrid Transmission Application Cases
2.587Km pure digital TV 1550nm overlength optical trunk application Cases
3. FTTH application diagram
Technical Index
| Performance |
Index |
Supplement |
| Optic feature |
Operating wavelength |
(nm) |
ITU-TG.692 standard wavelength |
|
| Wavelength ADJ. range |
(nm) |
±1.6 |
±200GHz |
| Wavelength ADJ. mode |
|
±0.05nm stepping |
|
| Wavelength stability |
(Pm/ºC) |
-1~0 |
Tc=20~70ºC |
| Linewidth |
(MHz) |
Typ.=0.35 |
FWHM(Δλ), (-3dB full width) |
| Side mode suppression ratio |
(dB) |
≥45 |
SMSR |
| Equivalent noise intensity |
(dB/Hz) |
≤-160 |
RIN (20~1000MHz) |
| Number of output port |
|
2 |
|
| Output power |
(dBm) |
2×10 |
Optional 2×7, 2×9, 2×11 |
| Return loss |
(dB) |
≥50 |
|
| Optical fiber connector |
|
SC/APC |
Optional FC/APC, LC/APC |
| RF feature |
Work bandwidth |
(MHz) |
47-1000 |
HT8500T-100 |
| 47-1080 |
HT8500T-108 |
| Input level |
(dBmV) |
18~28 |
AGC |
| Flatness |
(dB) |
≤±0.75 |
47~1000MHz |
| ≤±1.5 |
1000~1080MHz |
| Return loss |
(dB) |
>16 |
|
| Input impedance |
(Ω) |
75 |
|
| RF connector |
|
F-Female |
|
| Link feature |
Transmit channel |
|
PAL-D/60CH |
PAL-D/99CH |
|
| CNR1 |
(dB) |
≥54 |
≥52.5 |
Back to back |
| CNR2 |
(dB) |
≥52.5 |
≥50.5 |
65Km optical fiber, 0dBm receive |
| CTB |
(dB) |
≤-65 |
≤-65 |
|
| CSO |
(dB) |
≤-65 |
≤-65 |
|
| SBS restrain |
(dBm) |
13~19 |
Adjustable |
| General feature |
SNMP network management interface |
|
RJ45 |
|
| Communication interface |
|
RS232 |
|
| Power supply |
(VAC) |
90~265VAC |
50/60Hz |
| (VDC) |
-48 |
30~72 |
| Power Consume |
(W) |
≤50 |
Single power works |
| Operating temp. |
(ºC) |
0~50 |
Machine temp. control automatically |
| Storage temp. |
(ºC) |
-40~85 |
|
| Operating relative humidity |
(%) |
5~95 |
|
| Size |
(") |
19×14.5×1.75 |
(W)x(D)x(H) |
Audited Supplier 
Audited Supplier 
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